// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/files/file_path.h"
#include "base/strings/string_util.h"
#include "net/disk_cache/blockfile/mapped_file.h"
#include "net/disk_cache/disk_cache_test_base.h"
#include "net/disk_cache/disk_cache_test_util.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace {

// Implementation of FileIOCallback for the tests.
class FileCallbackTest : public disk_cache::FileIOCallback {
public:
    FileCallbackTest(int id, MessageLoopHelper* helper, int* max_id)
        : id_(id)
        , helper_(helper)
        , max_id_(max_id)
    {
    }
    ~FileCallbackTest() override { }

    void OnFileIOComplete(int bytes_copied) override;

private:
    int id_;
    MessageLoopHelper* helper_;
    int* max_id_;
};

void FileCallbackTest::OnFileIOComplete(int bytes_copied)
{
    if (id_ > *max_id_) {
        NOTREACHED();
        helper_->set_callback_reused_error(true);
    }

    helper_->CallbackWasCalled();
}

} // namespace

TEST_F(DiskCacheTest, MappedFile_SyncIO)
{
    base::FilePath filename = cache_path_.AppendASCII("a_test");
    scoped_refptr<disk_cache::MappedFile> file(new disk_cache::MappedFile);
    ASSERT_TRUE(CreateCacheTestFile(filename));
    ASSERT_TRUE(file->Init(filename, 8192));

    char buffer1[20];
    char buffer2[20];
    CacheTestFillBuffer(buffer1, sizeof(buffer1), false);
    base::strlcpy(buffer1, "the data", arraysize(buffer1));
    EXPECT_TRUE(file->Write(buffer1, sizeof(buffer1), 8192));
    EXPECT_TRUE(file->Read(buffer2, sizeof(buffer2), 8192));
    EXPECT_STREQ(buffer1, buffer2);
}

TEST_F(DiskCacheTest, MappedFile_AsyncIO)
{
    base::FilePath filename = cache_path_.AppendASCII("a_test");
    scoped_refptr<disk_cache::MappedFile> file(new disk_cache::MappedFile);
    ASSERT_TRUE(CreateCacheTestFile(filename));
    ASSERT_TRUE(file->Init(filename, 8192));

    int max_id = 0;
    MessageLoopHelper helper;
    FileCallbackTest callback(1, &helper, &max_id);

    char buffer1[20];
    char buffer2[20];
    CacheTestFillBuffer(buffer1, sizeof(buffer1), false);
    base::strlcpy(buffer1, "the data", arraysize(buffer1));
    bool completed;
    EXPECT_TRUE(file->Write(buffer1, sizeof(buffer1), 1024 * 1024, &callback,
        &completed));
    int expected = completed ? 0 : 1;

    max_id = 1;
    helper.WaitUntilCacheIoFinished(expected);

    EXPECT_TRUE(file->Read(buffer2, sizeof(buffer2), 1024 * 1024, &callback,
        &completed));
    if (!completed)
        expected++;

    helper.WaitUntilCacheIoFinished(expected);

    EXPECT_EQ(expected, helper.callbacks_called());
    EXPECT_FALSE(helper.callback_reused_error());
    EXPECT_STREQ(buffer1, buffer2);
}
